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Method for improving hardness and toughness of soft-package lithium battery

A soft-pack lithium battery and hardness technology, applied in coatings, polyester coatings, etc., can solve the problems of insufficient hardness and toughness of aluminum-plastic film, easy damage of aluminum-plastic film, easy deformation of batteries, etc., to achieve simple formula and raw material cost. Low, good sealing effect

Active Publication Date: 2018-12-07
深圳电丰电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hardness of the aluminum-plastic film outsourced to the soft-packed lithium battery is so poor that the battery is easily deformed, prone to pits, wrinkles, scratches and other poor appearance, and the aluminum-plastic film is easily damaged, especially in the field of power technology. Not enough, can't withstand long-term vibration and impact, which limits the development of soft-pack lithium batteries in this field
[0003] Patent document CN 102653656A discloses a method for improving the hardness and toughness of soft-pack batteries, which uses thermoplastic phenolic resin, rosin-modified alkyd resin, urea-formaldehyde resin, polyvinyl butyral or alcohol-soluble polyacrylic resin dissolved in methanol , ethanol, ethylene glycol, propanol, isopropanol, propylene glycol, n-butanol, isobutanol, 1,4-butanediol or hexanol, and then spray on the surface of the soft pack battery to form a coating film to improve the soft pack The hardness and toughness of the battery, however, the effect of this solution to improve the hardness and toughness of the pouch battery needs to be improved
[0004] Patent document CN 105111903A discloses a coating film preparation method for enhancing the hardness and toughness of soft-packed lithium batteries. It adopts a composition of alkyd resin, epoxy resin and polyether ether ketone as the coating film material, which is dissolved in acetone and acetic acid In the mixed solvent of butyl ester, then add defoamer and leveling agent to prepare a coating solution, and then spray it on the surface of the pouch battery to form a coating film to improve the hardness and toughness of the pouch battery. However, the formula of this scheme is more complicated. Defoamers and leveling agents need to be used to eliminate air bubbles and improve leveling and uniformity, otherwise the coating film is prone to defects such as fish eyes, pinholes, and dark bubbles

Method used

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  • Method for improving hardness and toughness of soft-package lithium battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1, the method of the present invention to improve the hardness and toughness of soft-pack lithium batteries

[0025] S1. Preparation of coating solution: Stir the solvent for 3 minutes at a stirring speed of 800 rpm, then add a composition of acrylic-modified alkyd resin, urea-formaldehyde resin and polyetheretherketone with a weight of 0.2% of the solvent, heat to 65°C, and stir 20min, then use acetic acid to adjust the pH value to 4, stop heating, continue to add solvent to adjust the viscosity of the system to 3000cps, and then stir for 10min to obtain the coating solution;

[0026] The weight ratio of the acrylic modified alkyd resin, urea-formaldehyde resin and polyether ether ketone is 1:0.6:0.2;

[0027] The solvent is a mixed solution of ethylene glycol and tetrahydrofuran, and the weight ratio of ethylene glycol and tetrahydrofuran is 2:1.

[0028] S2. Preparation of coating film: uniformly spray the coating solution prepared in step S1 on the surfa...

Embodiment 2

[0029] Embodiment 2, the method of the present invention to improve the hardness and toughness of soft-pack lithium batteries

[0030] S1. Preparation of coating solution: Stir the solvent for 6 minutes at a stirring speed of 1000 rpm, then add a composition of rosin-modified alkyd resin, urea-formaldehyde resin and polyether ether ketone with a solvent weight of 0.3%, heat to 75°C, and stir 40min, then use acetic acid to adjust the pH value to 6, stop heating, continue to add solvent to adjust the viscosity of the system to 5000cps, and then stir for 30min to obtain the coating solution;

[0031] The weight ratio of described rosin-modified alkyd resin, urea-formaldehyde resin and polyether ether ketone is 1:0.9:0.6;

[0032] The solvent is a mixed solution of propylene glycol and tetrahydrofuran, and the weight ratio of the propylene glycol and tetrahydrofuran is 4:1.

[0033] S2. Preparation of coating film: Use a spray gun to evenly spray the coating solution prepared in ...

Embodiment 3

[0034] Embodiment 3, the method of the present invention to improve the hardness and toughness of soft-pack lithium batteries

[0035] S1. Preparation of coating solution: Stir the solvent at a stirring speed of 900 rpm for 5 minutes, then add a composition of acrylic-modified alkyd resin, urea-formaldehyde resin and polyetheretherketone with a weight of 0.2% of the solvent, heat to 70°C, and stir 30min, then use acetic acid to adjust the pH value to 5, stop heating, continue to add solvent to adjust the viscosity of the system to 4000cps, and then stir for 20min to obtain the coating solution;

[0036] The weight ratio of the acrylic modified alkyd resin, urea-formaldehyde resin and polyether ether ketone is 1:0.8:0.4;

[0037] The solvent is a mixed solution of propylene glycol and tetrahydrofuran, and the weight ratio of the propylene glycol and tetrahydrofuran is 3:1.

[0038] S2. Preparation of coating film: uniformly spray the coating solution prepared in step S1 on the...

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Abstract

The invention belongs to the technical field of batteries, and particularly discloses a method for improving hardness and toughness of a soft-package lithium battery. The method comprises the following steps: S1, preparation of a coating liquid, to be more specific, stirring a solvent at a high speed, adding an alkyd resin, urea resin and polyetheretherketone composition, and stirring; continuingto add the solvent to adjust the viscosity of the system, and then stirring for 10 to 30 minutes to obtain the coating liquid; S2, coating film preparation, to be more specific, uniformly spraying thecoating liquid prepared in the step S1 by a spray gun onto the surface of the soft-package lithium battery, and allowing the coating liquid to stand at room temperature or baking the at a high temperature in a vacuum state until the coating liquid is dried to form a coating film on the surface of the soft-package lithium battery. The method has simple formula and stable process, and the preparedcoating film can effectively improve the hardness and the toughness of the soft-package lithium battery, has excellent abrasion resistance, corrosion resistance and water resistance, effectively protects the soft-package lithium battery, and extends the life of the soft-package lithium battery.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a method for improving the hardness and toughness of a soft-pack lithium battery. Background technique [0002] Soft-pack lithium batteries are characterized by the combination of the basic electrochemical properties of liquid lithium batteries and the unique advantages of polymer lithium batteries in appearance and packaging, and use a liquid electrolyte similar to liquid lithium batteries as a means of transporting lithium ions between the positive and negative electrodes. medium. Compared with metal shell or plastic shell batteries, soft pack lithium batteries have good safety performance, thin thickness, flexible design, and lower cost, so they are favored by users at home and abroad. At the same time, the outstanding advantages of the soft pack lithium battery are its simple production process, low cost and high yield. However, the hardness of the aluminum-pl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D167/08C09D161/24C09D161/16
CPCC08L2203/20C08L2205/03C09D167/08C08L61/24C08L61/16
Inventor 皮远建张福建彭吕红
Owner 深圳电丰电子有限公司